Anode carbon block structure for prebaking aluminum cell with no residue anode

Abstract

The invention discloses an anode carbon block structure for a prebaking aluminum cell with no residue anode. The anode carbon block structure comprises a carbon block body (15). An upper carbon block T-shaped connection convex head (19) is arranged on the top of the carbon block body (15). The two sides of the upper carbon block T-shaped connection convex head (19) are provided with T-shaped connection convex head force-bearing shoulders (17). The bottom of the upper carbon block T-shaped connection convex head (19) is provided with a lower carbon block T-shaped connection groove (11) used in cooperation with the upper carbon block T-shaped connection convex head (19). The bottom of the lower carbon block T-shaped connection groove (11) is provided with T-shaped connection groove hook force-bearing shoulder (18). The anode carbon block structure has the advantages that no residue anode is generated after the anode carbon block structure is used in cooperation with a mechanical connection steel claw, the utilization rate of the anode carbon block is improved from traditional 70-80% to 100%, the production cost of electrolytic aluminum can be lowered, the working conditions of the electrolytic cell is stable, electrical losses are low relatively, and heat energy is saved.

Description

technical field [0001] The invention relates to an anode structure of an aluminum electrolytic cell, in particular to an anode carbon block structure produced by a prebaked aluminum electrolytic cell without residual poles. Background technique [0002] In the modern electrolytic aluminum industry, prebaked anodes are used to produce electrolytic aluminum. The prebaked anode is generally a cuboid with a stable geometric shape. It uses stone tar and pitch coke as the aggregate and coal tar pitch as the binder. It has different sizes according to the size of the electrolytic cell current and the process. Its current density Generally at 0.68-0.9A / cm 2 Within the range, the service life of each carbon block is generally 23-30 days. [0003] In the existing prebaked anode electrolytic aluminum production, the anode steel claws and the anode carbon block are all connected by casting of phosphorus pig iron, and there are 2-4 diameters of 160-180mm on the upper surface of the pre...

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Problems solved by technology

[0005] At present, the traditional way to deal with the anode residues is to smash and fall off the residues connected to the conductive rods in the anode assembly workshop, and then use the aluminum conductive rods after the broken anode steel bowls cast by phosphorus pig iron to be used in new ones. The carbon block is recycled in this way, which results in a time-consuming and laborious replacement process for the carbon block. At the same time, a large amount of heat on the anode butt is also taken away and cannot be used. When a new anode is inserted into the electrolytic cell, the carbon block needs to be replaced. And the steel claws can only conduct electricity normally after reheating to a certain temperature, resulting in waste of heat and reducing the efficiency of electrolysis

[0006] And under normal circumstances, the production of anode residues is 10-15% of the output of aluminum ingots, resulting in a great waste. According to the current annual production of 26-27 million tons of electrolytic aluminum in my country, the anode residues are as high as 260-390 tons. 10,000 tons / year, according to the value of anode carbon block 2700 yuan / ton, the value of wasted anode carbon block reaches tens of billions of yuan every year, and the waste in the world is even more. Carbon itself has a porosity of 25-27%, and a large amount of electrolyte is adsorbed in the body of the residual electrode. The main component of the electrolyte is fluoride salt, and the anode residual electrode containing a large amount of fluoride salt is very serious to the environment.

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